Here is the full list of all 27 Solitairica achievements.
Unlock the Warrior deck
Have your heart broken
Start a new journey after your heart breaks the first time
Visit the Meadows of Madness
Visit the Blandlands
Visit the Ruinous Bog
Visit Tangleslime Swamp
Visit the Cliffs of Mythos
Enter Castle Stuck
Unlock a second deck
Upgrade your first card in any deck
Defeat Emperor Stuck
Collect 50+ coins from a single card
Cause the enemy to sacrifice the last card
Break your heart by taking fatal damage on the last card
Collect a wildstone from a card
Defeat the enemy without using any spells
Fill the bar for all energy types.
Use Cosmic Inversion to go from 1 health to full
Buy all 3 potions in a single journey
Match 10 cards in a row
Match every numeral in a single streak
Battle all 18 enemy types
Encounter all enemy traits
Buy every item in the game
Buy every spell in the game
Defeat Emperor Stuck with every deck